Unsurprisingly, setting the random seed makes the random_expr() always
return the same value:

sage: set_random_seed(0xdeadbeef)
sage: random_expr(5)
tanh(-pi^real_part(v1)*sin(log(pi)*imag_part(v1)))
sage: set_random_seed(0xdeadbeef)
sage: random_expr(5)
tanh(-pi^real_part(v1)*sin(log(pi)*imag_part(v1)))
sage: random_expr(5)
v1 + arccos(e/golden_ratio)

I suggest that the doctests for sage.symbolic.random_tests simply set
the random seed to a fixed value.

Volker

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